Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf498f993538ec2…

MALICIOUS

PDF

41.7 KB Created: 2021-04-27 08:06:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7ebfcc76f92191fb121ea605a86efa2e SHA-1: a7f045a6e9af86b5dcf8c1c8ca19a15ccf8d4438 SHA-256: 8bf498f993538ec284d437db1b83fcbc8d6fb5eab2506e95d0e3c5ae90faf8fc
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure related to 'free pins for Roblox' and includes an external URI pointing to a suspicious URL. Notably, it contains instructions to disable security software, which is a high-risk indicator. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the presence of external links and the security bypass instruction strongly suggest a malicious intent to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/free-pins-for-roblox-game-hack PDF link annotation
    • http://www.saburai.ac.id/elibrary//repository/free-robux-promo-codes-september-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/hack-roblox-vehicle-simulator-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/hack-tool-for-roblox-pc.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-roblox-bloxburg-for-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-do-you-get-free-robux-on-roblox-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-face-roblox-makeup.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-1-robux.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/websites-to-hack-roblox-accounts.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/create-own-free-skin-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-free-robux-in-roblox-iphone.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004090.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4090 29424 bytes
SHA-256: fdabb2d22fda65a2b97eaeeee1c0a97498b5d2ca5fb897fab94f55fc34d15ab1
font_01_sfnt_off00008197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8197 18220 bytes
SHA-256: ebd7e304817114edf898e8608ac1af7a174aa9b8992b319e33977208a53e726e

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